Vaisala HMT360Series Guide de l'utilisateur télécharger pdf (Page 66)

User’s Guide ______________________________________________________________________

64 ___________________________________________________________________ M010056EN-J

Calculating Correspondence of Current Values

and Output Quantities

When using HMT360 without a display, calibration and adjustment is

carried out by using a multimeter. Use the following equations to calculate

the current values corresponding to the reference output quantities.

0605-015

Example 1:

Relative humidity scaling 0 ... 100 %RH, reference 11.3 %RH:

0605-016

Example 2:

Temperature scaling -40 ... +120 °C, reference 22.3 °C:

0605-017

where

ref

= Reference value of the calibrated quantity

min

= Reference value of the calibrated quantity

max

= Value corresponding to 20 mA

I 4 mA 16 mA

ref

min

–

max

min

–

-----------------------------

⋅+=

I 4 mA 16 mA

11.3 %RH 0 %RH–

100 %RH 0 %RH–

-------------------------------------------------

⋅+ 5.808 mA==

I 4 mA 16 mA

22.3° C40° C–

120° C40° C–

--------------------------------------

⋅+ 10.230 mA==

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Vaisala HMT360Series Guide de l'utilisateur Page 66